Study of mineral dust entrainment in the planetary boundary layer by lidar depolarisation technique

Antonio Bravo-Aranda, Juan; Titos, Gloria; José Granados-Muñoz, MarÍa; Guerrero-Rascado, Juan LuÍs; Navas Guzman, Francisco Jesus; Valenzuela, Antonio; Lyamani, Hassan; José Olmo, Francisco; Andrey, Javier; Alados-Arboledas, Lucas (2015). Study of mineral dust entrainment in the planetary boundary layer by lidar depolarisation technique. Tellus. Series B - chemical and physical meteorology, 67, p. 26180. Munksgaard 10.3402/tellusb.v67.26180

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Measurements on 27 June 2011 were performed over the Southern Iberian Peninsula at Granada EARLINET station, using active and passive remote sensing and airborne and surface in-situ data in order to study the entrainment processes between aerosols in the free troposphere and those in the planetary boundary layer (PBL). To this aim the temporal evolution of the lidar depolarisation, backscatter-related Angström exponent and potential temperature profiles were used in combination with the PBL contribution to the aerosol optical depth (AOD). Our results show that the mineral dust entrainment in the PBL was caused by the convective processes which ‘trapped’ the lofted mineral dust layer, distributing the mineral dust particles within the PBL. The temporal evolution of ground-based in-situ data evidenced the impact of this process at surface level. Finally, the amount of mineral dust in the atmospheric column available to be dispersed into the PBL was estimated by means of POLIPHON (Polarizing Lidar Photometer Networking). The dust mass concentration derived from POLIPHON was compared with the coarse-mode mass concentration retrieved with airborne in-situ measurements. Comparison shows differences below 50 µg/m³ (30% relative difference) indicating a relative good agreement between both techniques.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Microwaves

UniBE Contributor:

Navas Guzman, Francisco Jesus

Subjects:

600 Technology > 620 Engineering
500 Science
500 Science > 530 Physics

ISSN:

0280-6509

Publisher:

Munksgaard

Language:

English

Submitter:

Martin Frenz-Lips

Date Deposited:

08 Feb 2016 09:39

Last Modified:

26 Jun 2016 02:10

Publisher DOI:

10.3402/tellusb.v67.26180

BORIS DOI:

10.7892/boris.74997

URI:

https://boris.unibe.ch/id/eprint/74997

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